[IPV6]: Cache source address as well in ipv6_pinfo{}.

Based on MIPL2 kernel patch.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index eb9e1b3..b9cc55c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -847,7 +847,12 @@
 		if (connected) {
 			ip6_dst_store(sk, dst,
 				      ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
-				      &np->daddr : NULL);
+				      &np->daddr : NULL,
+#ifdef CONFIG_IPV6_SUBTREES
+				      ipv6_addr_equal(&fl->fl6_src, &np->saddr) ?
+				      &np->saddr :
+#endif
+				      NULL);
 		} else {
 			dst_release(dst);
 		}